Tootfinder

Exploring Stellar Activity in a Sample of Active M Dwarfs
A. S. Rajpurohit, V. Kumar, K. Srivastava Mudit, L. Labadie, K. Rajpurohit, J. G. Fernandez-Trincado
https://arxiv.org/abs/2510.02693

Exploring Stellar Activity in a Sample of Active M Dwarfs
Most M dwarfs show higher chromospheric activity, often exceeding solar levels. Characterizing stellar activity is essential, particularly since these stars are prime targets in the search for habitable exoplanets. We investigate the stellar activity of active M dwarfs using TESS photometry combined with spectroscopic observations. We explore relations between flare occurrence rate (FOR), flare energies, rotation period, starspot filling factor, and chromospheric indicators. We also examine cor…

HR-pyPopStar II: high spectral resolution evolutionary synthesis models low metallicity expansion and the properties of the stellar populations of dwarf galaxies
I. Mill\'an-Irigoyen, M. Moll\'a, M. Cervi\~no, M. L. Garc\'ia-Vargas
https://arxiv.org/abs/2510.02886

HR-pyPopStar II: high spectral resolution evolutionary synthesis models low metallicity expansion and the properties of the stellar populations of dwarf galaxies
Low metallicity stellar populations are very abundant in the Universe, either as the remnants of the past history of the Milky Way or similar spiral galaxies, or the young low metallicity stellar populations that are being observed in the local dwarf galaxies or in the high-z objects with low metal content recently found with JWST. Our goal is to develop new high-spectral-resolution models tailored for low-metallicity environments and apply them to analyse stellar population data, particularly …

Stellar occultations in support of the LUMIO orbit determination
Davide Banzi, Riccardo Lasagni Manghi, Marco Zannoni
https://arxiv.org/abs/2509.04177 https://

Stellar occultations in support of the LUMIO orbit determination
This work investigates the use of stellar occultation measurements to enhance the orbit determination performance of the Lunar Meteoroid Impact Observer (LUMIO) mission, operating from a quasi-Halo orbit around the Earth-Moon L2 point. During science phases, when radiometric tracking is sparse and low illumination limits conventional optical navigation methods, occultation events, defined as precise timings of stellar appearances/disappearances behind the Moon's limb, offer a suitable alternati…

Cosmography via stellar archaeology of low-redshift early-type galaxies from SDSS
Carlos A. \'Alvarez, Marcos M. Cueli, Alessandro Bressan, Lumen Boco, Balakrishna S. Haridasu, Michele Bosi, Luigi Danese, Andrea Lapi
https://arxiv.org/abs/2509.04224

Cosmography via stellar archaeology of low-redshift early-type galaxies from SDSS
Cosmic chronometers offer a model-independent way to trace the expansion history of the Universe via the dating of passively evolving objects. This enables testing the validity of cosmological models without concrete assumptions of their energy content. The main goal of this work is to derive model-independent constraints on the Hubble parameter up to $z \sim 0.4$ using stellar ages from the fitting of Lick index absorption lines in passively evolving galaxies. Contrary to recent related works …

Determining the impact of post-main-sequence stellar evolution on the transiting giant planet population: #planets: https://ras.ac.uk/news-and-press/research-highlights/ageing-stars-may-be-destroying-their-closest-planets

Axion lines from nuclear de-excitations in galactic stellar populations
Orion Ning, Anupam Ray, Benjamin R. Safdi
https://arxiv.org/abs/2509.03569 https://…

Axion lines from nuclear de-excitations in galactic stellar populations
We show that mono-energetic axions are produced in abundance through nuclear de-excitations in nearby galaxies such as M87, which is the central galaxy of the Virgo cluster, and the starburst galaxy M82. If the axion couples to both nucleons and photons and is ultralight, then monochromatic hard X-ray signatures are induced by the subsequent axion-to-photon conversion in the magnetic fields permeating these systems. We search for evidence of such signals using NuSTAR data, focusing specifically…

A Kinematic History of Stellar Encounters with Beta Pictoris
Jose Luis Gragera-M\'as (Centro de Astrobiolog\'ia, Departamento de F\'isica de la Tierra y Astrof\'isica, Facultad de Ciencias F\'isicas, Universidad Complutense de Madrid), Santiago Torres (Institute of Science and Technology Austria), Alexander James Mustill (Lund Observatory, Division of Astrophysics, Department of Physics, Lund University), Eva Villaver (Instituto de Astrof\'isica de Canarias, Uni…

A Kinematic History of Stellar Encounters with Beta Pictoris
Beta Pictoris is an A-type star hosting a complex planetary system with two massive gas giants and a prominent debris disk. Variable absorption lines in its stellar spectrum have been interpreted as signatures of exocomets (comet-like bodies transiting the star). Stellar flybys can gravitationally perturb objects in the outer comet reservoir, altering their orbits and potentially injecting them into the inner system, thereby triggering exocomet showers. We aim to assess the contribution of st…

The origin of the galaxy size-stellar metallicity relation: A semi-analytical perspective
Kai Wang (Durham University)
https://arxiv.org/abs/2510.02573 https://

The origin of the galaxy size-stellar metallicity relation: A semi-analytical perspective
Stellar metallicity encodes the integrated effects of gas inflow, star formation, and feedback-driven outflow, yet its connection to galaxy structure remains poorly understood. Using SDSS-IV MaNGA, we present the direct observational evidence that, at fixed stellar mass, smaller central galaxies are systematically more metal-rich, with a Spearman's rank correlation coefficient reaching $R_{\rm s}\approx -0.4$. The semi-analytical model L-GALAXIES reproduces this anti-correlation, albeit with a …

Jonathan Gannon stands by Kyler Murray despite stellar Jacoby Brissett performance

https://www.cbssports.com/nfl/news/kyler-murray-cardinals-qb-jacoby-brissett-…

Revisiting the Radius Valley Across Stellar Types: A Transit-Only Analysis of M, K, G, and F Stars with Updated NASA Exoplanet Archive Data
Sukdev Mahapatra
https://arxiv.org/abs/2509.03549

Revisiting the Radius Valley Across Stellar Types: A Transit-Only Analysis of M, K, G, and F Stars with Updated NASA Exoplanet Archive Data
The radius valley -- a deficit of exoplanets between super-Earths and sub-Neptunes -- is a key diagnostic of planet formation and atmospheric evolution. We investigate how the radius valley depends on stellar type by analyzing an updated, transit-only sample of exoplanets from the NASA Exoplanet Archive. Planets are selected with $P < 100$ days and divided by host spectral class (M, K, G, F). We construct weighted radius distributions and apply statistical tests to quantify the valley depth. We…

On the origin of counterrotating stellar disks in TNG50. I
M. C. Bugue\~no, Facundo A. G\'omez, Arianna Dolfi, Patricia B. Tissera
https://arxiv.org/abs/2510.03106 https://

On the origin of counterrotating stellar disks in TNG50. I
Understanding galaxy evolution is key to explaining the structures we observe in the present-day Universe. Counterrotating stellar disks (CRDs), i.e. co-spatial stellar disks rotating with opposite angular momentum, have been proposed as signatures of past accretion events. Therefore, they constitute potentially valuable tracers of galactic assembly. We aim to investigate the properties, formation, and significance of CRDs in a sample of Milky Way mass galaxies using the IllustrisTNG cosmologic…

The ODYSSEUS Survey. Using accretion and stellar rotation to reveal the star-disk connection in T Tauri stars
Caeley V. Pittman, C. C. Espaillat, Zhaohuan Zhu, Thanawuth Thanathibodee, Connor E. Robinson, Nuria Calvet, \'Agnes K\'osp\'al
https://arxiv.org/abs/2509.03767

The ODYSSEUS Survey. Using accretion and stellar rotation to reveal the star-disk connection in T Tauri stars
Classical T Tauri stars (CTTS) exhibit strong variability over timescales of minutes to decades. However, much theoretical work assumes that CTTS are in stable spin states. Here, we test expectations for CTTS angular momentum regulation by comparing star and disk rotation. We measure stellar rotation periods and disk corotation radii ($R_{\rm co}$) for 47 CTTS from the HST ULLYSES sample. We compare $R_{\rm co}$ to the magnetospheric truncation radii ($R_{\rm i}$) and show that most CTTS are in…

Evidence of the pair instability gap in the distribution of black hole masses
Hui Tong, Maya Fishbach, Eric Thrane, Matthew Mould, Thomas A. Callister, Amanda Farah, Nir Guttman, Sharan Banagiri, Daniel Beltran-Martinez, Ben Farr, Shanika Galaudage, Jaxen Godfrey, Jack Heinzel, Marios Kalomenopoulos, Simona J. Miller, Aditya Vijaykumar
https://

Evidence of the pair instability gap in the distribution of black hole masses
Stellar theory predicts a forbidden range of black-hole masses between ${\sim}50$--$130\,M_\odot$ due to pair-instability supernovae, but evidence for such a gap in the mass distribution from gravitational-wave astronomy has proved elusive. Early hints of a cutoff in black-hole masses at ${\sim} 45\,M_\odot$ disappeared with the subsequent discovery of more massive binary black holes. Here, we report evidence of the pair-instability gap in LIGO--Virgo--KAGRA's fourth gravitational wave transien…

Just finished "The Songbird and the Rambutan Tree" by Lucille Abendanon. It's a pretty good and engaging work of historical fiction set in Indonesia (then the Dutch East Indies) during World War II, with a 12-year-old Dutch girl who grew up locally as the protagonist.
It's written to be accessible to a pre-teen audience, despite the fairly grim backdrop. I think it does an okay if not stellar job dealing with the complicated colonial situation for a young audience. Overall, I like it.
#AmReading

Inferring Stellar Densities with Flexible Models I: The Distribution of RR Lyrae in the Milky Way with $\textit{Gaia}$ DR3
Madeline Lucey, Cecilia Mateu, Adrian Price-Whelan, David Hogg, Hans-Walter Rix, Robyn Sanderson
https://arxiv.org/abs/2510.03221

Inferring Stellar Densities with Flexible Models I: The Distribution of RR Lyrae in the Milky Way with $\textit{Gaia}$ DR3
Understanding the formation and evolutionary history of the Milky Way requires detailed mapping of its stellar components, which preserve fossil records of the Galaxy's assembly through cosmic time. RR Lyrae stars are particularly well-suited for this endeavor, as they are old, standard candle variables that probe the Galaxy's earliest formation epochs. In this work, we employ a hierarchical Bayesian Gaussian Mixture Model (GMM) to characterize the three-dimensional density distribution of RR L…

Stellar-activity analysis of the nearby M dwarf GJ 526. Multi-dimensional Gaussian-process modelling of RV, FWHM and S-index
A. K. Stefanov, J. I. Gonz\'alez Hern\'andez, A. Su\'arez Mascare\~no, R. Rebolo, N. Nari, J. M. Mestre, S. G. Sousa, H. M. Tabernero, M. -R. Zapatero Osorio, P. Figueira, J. P. Faria, M. J. Hobson, A. M. Silva, A. Castro-Gonz\'alez, N. C. Santos, A. Sozzetti, F. Pepe, S. Cristiani, B. Lavie, C. J. A. P. Martins

Stellar-activity analysis of the nearby M dwarf GJ 526. Multi-dimensional Gaussian-process modelling of RV, FWHM and S-index
M dwarfs are the most abundant stars in the Galaxy, and their low masses make them natural favourites for exoplanet radial-velocity (RV) searches. Nevertheless, these stars often demonstrate strong stellar activity that is yet to be fully understood. We use high-precision ESPRESSO, HIRES, and HARPS spectroscopy to perform a stellar-activity analysis on the nearby early M dwarf GJ 526 ($d=5.4$ pc). We carry out joint modelling of: (i) stellar rotation in RV, FWHM, and Mount Wilson S-index throug…

The evolution of PUCHEROS from a basic to a competitive tool for stellar astrophysics
Luca Antonucci, Leonardo Vanzi, Abner Zapata, Mauricio Flores, Angelica Suarez, Rafael Brahm, Tzu Shen, Manuel Parra, Rafael Ormazabal, Gerardo Avila, Petr Kabath, Artie Hatzes, Pavol Gajdos, Marek Skarka, Jiri Zak, Petra Odert, Jozef Liptak, Robert Greimel, Martin Leitzinger
…

The evolution of PUCHEROS from a basic to a competitive tool for stellar astrophysics
We present PUCHEROS +, a new spectrograph developed as an enhanced version of PUCHEROS (Pontificia Universidad Catolica High Echelle Resolution Optical Spectrograph), which was the first high-resolution spectrograph built at the Pontificia Universidad Catolica de Chile (UC). With respect to its predecessor, PUCHEROS + includes a substantial number of improvements, mainly: a new scientific detector, improved objective optics, calibration system, guiding, active thermal control, and remote observ…

Mapping the Stellar Kinematics in the Central 240 Parsecs of M87 with the James Webb Space Telescope
Refa M. Al-Amri, Jonelle L. Walsh, Emily R. Liepold, Chung-Pei Ma, Jenny E. Greene
https://arxiv.org/abs/2510.02439

Mapping the Stellar Kinematics in the Central 240 Parsecs of M87 with the James Webb Space Telescope
The supermassive black hole (SMBH) in the giant elliptical galaxy M87 is one of the most well-studied in the local universe, but the stellar- and gas-dynamical SMBH mass measurements disagree. As this galaxy is a key anchor for the upper end of the SMBH mass$-$host galaxy relations, we revisit the central $3''\times 3''$ ($\sim 240\times240$ pc) region of M87 with the Near Infrared Spectrograph (NIRSpec) integral field unit (IFU) on the James Webb Space Telescope (JWST). We implement several im…

A Mid-Infrared Spectroscopic Study of Young Stellar Objects in the SMC Region NGC 346: JWST Detects Dust, Accretion, Ices and Outflows
Nolan Habel, Omnarayani Nayak, Patrick J. Kavanagh, Olivia C. Jones, Margaret Meixner, Guido De Marchi, Laura Lenkic, Alec S. Hirschauer, Katia Biazzo, Jeroen Jaspers, Conor Nally, Massimo Robberto, Ciaran Rogers, Elena Sabbi, Beth A. Sargent, Peter Zeidler

A Mid-Infrared Spectroscopic Study of Young Stellar Objects in the SMC Region NGC 346: JWST Detects Dust, Accretion, Ices and Outflows
We present mid-infrared spectroscopic observations of intermediate- to high-mass young stellar objects (YSOs) in the low-metallicity star-forming region NGC 346 located within the Small Magellanic Cloud (SMC). We conduct these integral-field-unit observations with the Mid-Infrared Instrument Medium Resolution Spectroscopy instrument on board JWST. The brightest and most active star-forming region in the SMC, NGC 346 has a metallicity of $\sim$1/5 $Z_{\odot}$, analogous to the era when star form…

StrCGAN: A Generative Framework for Stellar Image Restoration
Shantanusinh Parmar
https://arxiv.org/abs/2509.19805 https://arxiv.org/pdf/2509.19805

StrCGAN: A Generative Framework for Stellar Image Restoration
We introduce StrCGAN (Stellar Cyclic GAN), a generative model designed to enhance low-resolution astrophotography images. Our goal is to reconstruct high-fidelity ground truth-like representations of celestial objects, a task that is challenging due to the limited resolution and quality of small-telescope observations such as the MobilTelesco dataset. Traditional models such as CycleGAN provide a foundation for image-to-image translation but are restricted to 2D mappings and often distort the m…

Weakened Magnetic Braking Signals the Collapse of the Global Stellar Dynamo
Travis S. Metcalfe, Jennifer L. van Saders, Marc H. Pinsonneault, Thomas R. Ayres, Oleg Kochukhov, Keivan G. Stassun, Adam J. Finley, Victor See, Ilya V. Ilyin, Klaus G. Strassmeier
https://arxiv.org/abs/2509.03717

Weakened Magnetic Braking Signals the Collapse of the Global Stellar Dynamo
Weakened magnetic braking (WMB) was originally proposed in 2016 to explain anomalously rapid rotation in old field stars observed by the Kepler mission. The proximate cause was suggested to be a transition in magnetic morphology from larger to smaller spatial scales. In a series of papers over the past five years, we have collected spectropolarimetric measurements to constrain the large-scale magnetic fields for a sample of stars spanning this transition, including a range of spectral types fro…

Can Quasi-periodic Eruptions Produce Detectable High Energy Neutrinos?
Zhi-peng Ma, Kai Wang
https://arxiv.org/abs/2509.03904 https://arxiv.org/pdf/2509.03…

Can Quasi-periodic Eruptions Produce Detectable High Energy Neutrinos?
Quasi-periodic eruptions (QPEs) are a class of X-ray flaring phenomena that occur at the centers of galactic nuclei and are likely to arise from repeated interactions between a star and an accretion disk. This work investigates whether such disk-crossing events can accelerate protons and generate detectable high-energy neutrinos. Based on observed QPE luminosities, recurrence periods, and flare durations, the stellar motion parameters and the disk properties are evaluated. We consider proton ac…

#Occultation Light Curves and the Case of TOI-3884: https://iopscience.iop.org/article/10.3847/1538-4357/adf6be -> Astronomers Map Stellar ‘Polka Dots’ Using NASA’s TESS, Kepler: https://science.nasa.gov/missions/tess/astronomers-map-stellar-polka-dots-using-nasas-tess-kepler/

Breaking Down the $\textsf{CosmoGEMS}$: Toward Modeling and Understanding Globular Cluster Stellar Streams in a Fully Cosmological Context
Nondh Panithanpaisal, Robyn E. Sanderson, Carl L. Rodriguez, Tjitske Starkenburg, Sarah Pearson, Ana Bonaca, Philip F. Hopkins, Brian T. Cook, Arpit Arora, Newlin C. Weatherford
https://arxiv.org/abs/25…

Breaking Down the $\textsf{CosmoGEMS}$: Toward Modeling and Understanding Globular Cluster Stellar Streams in a Fully Cosmological Context
Next-generation surveys are expected to uncover thousands of globular cluster (GC) stellar streams, motivating the need for a theoretical framework that produces realistic GC streams in a fully cosmological, Milky Way-like environment. We present $\textsf{CosmoGEMS}$, a star-by-star cosmological GC stream framework that self-consistently links small-scale cluster physics with large-scale Galactic dynamics. The initial phase-space positions of stream stars are informed by post-processed GC popul…

Tracing stellar rotation in young massive LMC clusters
Sebastian Kamann, Nate Bastian, Florian Niederhofer, Andrea Bellini, Ivan Cabrera-Ziri, Stefan Dreizler, Fabian G\"ottgens, Vera Kozhurina-Platais, Mattia Libralato, Sven Martens, Sara Saracino
https://arxiv.org/abs/2509.02698

Tracing stellar rotation in young massive LMC clusters
We present a detailed analysis of stellar rotation along the main sequences of NGC 1866 and NGC 1856, two young (~200-300 Myr) massive clusters in the Large Magellanic Cloud, using MUSE integral field spectroscopy. Differences in stellar rotation have been proposed as an explanation for the extended main sequence turn-offs and split main sequences in these clusters. In agreement with this idea, we find strong links between the photometric colours of the cluster stars and their projected rotatio…

Jim Harbaugh on Chargers QB's three-TD night: 'Just another stellar performance by Justin Herbert' https://www.nfl.com/news/jim-harbaugh-on-chargers-qb-s-three-td-night-just-another-stellar-performance-by-justin-h…

Robust bounds on MACHOs from the faintest galaxies
Peter W. Graham, Harikrishnan Ramani, Maximilian Ruhdorfer
https://arxiv.org/abs/2510.01310 https://arxi…

Robust bounds on MACHOs from the faintest galaxies
We use the dynamical heating of stars in ultrafaint dwarf (UFD) galaxies to set limits on Massive Compact Halo Objects (MACHOs). In our analysis we study the robustness of the bounds under uncertainties in key UFD parameters, such as the half-light radius, stellar velocity dispersion, total halo mass and dark matter and stellar density profiles. We apply this framework to both well-established UFD candidates, as well as the recently discovered UFD candidate Ursa Major III/UNIONS 1. We find that…

Crosslisted article(s) found for astro-ph.EP. https://arxiv.org/list/astro-ph.EP/new
[1/1]:
- A Kinematic History of Stellar Encounters with Beta Pictoris
Jose Luis Gragera-M\'as, Santiago Torres, Alexander James Mustill, Eva Villaver

Analytic Interferometry of Rotating Stellar Surfaces
Shashank Dholakia, Benjamin J. S. Pope
https://arxiv.org/abs/2509.25433 https://arxiv.org/pdf/2509.254…

Analytic Interferometry of Rotating Stellar Surfaces
The surfaces of rotating stars serve as a window into their interiors, magnetic dynamos, and are important in other areas including exoplanet discovery and atmospheric characterization. While indirect techniques such as photometry and Doppler imaging have been studied for their ability to map stellar surfaces, the gold standard remains optical long-baseline interferometry. In this paper, we develop new closed-form solutions for the interferometric visibility of a rotating star with an arbitrary…

Search for Past Stellar Encounters and the Origin of 3I/ATLAS
Yiyang Guo, Luyao Zhang, Fabo Feng, Zhao-Yu Li, Anton Pomazan, Xiaohu Yang
https://arxiv.org/abs/2509.03361 https:/…

Search for Past Stellar Encounters and the Origin of 3I/ATLAS
3I/ATLAS, the third discovered interstellar object, has a heliocentric speed of 58 km/s and exhibits cometary activity. To constrain the origin of 3I/ATLAS and its past dynamical evolution, we propagate the orbits of 3I/ATLAS and nearby stars to search for stellar encounters. Integrating orbits in the Galactic potential and propagating the astrometric and radial-velocity uncertainties of 30 million Gaia stars, we identify 25 encounters with median encounter distances less than 1 pc. However, be…

Hot #cosmology papers ...
The Perfect Host - JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements: https://arxiv.org/abs/2509.01667
Glimmers in the Cosmic Dawn - On the Photometrically Determined Black Hole Mass to Stellar Mass Relation Across Cosmic Time: https://arxiv.org/abs/2508.15905
The coherent satellite velocity field around the interacting spiral galaxy pair NGC5713/19 - signature of two galaxy groups merging: https://academic.oup.com/mnras/article/542/1/62/8215207?login=false
Looking beyond lambda: https://arxiv.org/abs/2509.00359

The HST-Hyperion Survey: Environmental Imprints on the Stellar-Mass Function at z=2.5
Derek Sikorski, Ben Forrest, Brian C. Lemaux, Lu Shen, Finn Giddings, Roy Gal, Olga Cucciati, Emmet Golden-Marx, Weida Hu, Denise Hung, Lori Lubin, Kaila Ronayne, Ekta Shah, Sandro Bardelli, Devontae C. Baxter, Gayathri Gururajan, Laurence Tresse, Giovanni Zamorani, Joel Diamond, Lucia Guaita, Nimish Hathi, Elena Zucca

The HST-Hyperion Survey: Environmental Imprints on the Stellar-Mass Function at z=2.5
Not all galaxies at Cosmic Noon evolve in the same way. It remains unclear how the local environment -- especially the extreme overdensities of protoclusters -- affects stellar mass assembly at high redshift. The stellar mass function (SMF) encodes these processes; comparing SMFs across environments reveals differences in evolutionary history. We present the SMF of the Hyperion proto-supercluster at $z\sim2.5$, one of the largest and most massive protostructures known. This dataset provides the…

The oldest Milky Way stars: New constraints on the age of the Universe and the Hubble constant
Elena Tomasetti, Cristina Chiappini, Samir Nepal, Michele Moresco, Carmela Lardo, Andrea Cimatti, Friedrich Anders, Anna B. A. Queiroz, Guilherme Limberg
https://arxiv.org/abs/2509.02692

The oldest Milky Way stars: New constraints on the age of the Universe and the Hubble constant
We exploit the most robust, old, and cosmology-independent age estimates of individual stars from Gaia DR3 to place a lower bound on the age of the Universe, $t_U$. These constraints can serve as an anchor point for any cosmological model, providing an upper limit to the Hubble constant $H_0$. We consider the stellar age catalog of arXiv:2402.00561, selecting 3,000 of the oldest and most robustly measured main sequence turn-off (MSTO) and subgiant branch (SGB) stars, with ages $>12.5$ Gyr and a…

The changing transit shape of TOI-3884 b
Hritam Chakraborty, Jose M. Almenara, Monika Lendl, David Ehrenreich, Fran\c{c}ois Bouchy, Xavier Bonfils, Radmila Dancikova, Adrien Deline, Saniya Khan, Henryka Netzel, Muskan Shinde, Aur\'elien Verdier
https://arxiv.org/abs/2509.04297

The changing transit shape of TOI-3884 b
TOI-3884 b is a sub-Saturn transiting a fully convective M-dwarf. Observations indicate that the transit shape is chromatic and asymmetric as a result of persistent starspot crossings. This, along with the lack of photometric variability of the host star, indicates that the rotational axis of the star is tilted along our line of sight and the planet-occulted starspot is located close to the stellar pole. We acquired photometric transits over a period of three years with the Swiss 1.2-meter Eule…

Fates of Rotating Supergiants from Stellar Mergers and the Landscape of Transients upon Core-collapse
Daichi Tsuna (Caltech), Jim Fuller (Caltech), Wenbin Lu (UC Berkeley)
https://arxiv.org/abs/2508.21116

Fates of Rotating Supergiants from Stellar Mergers and the Landscape of Transients upon Core-collapse
We present a grid of rotating supergiant models from post-main sequence binary merger products, constructed by the MESA stellar evolution code. We focus on the evolution of these stars until core-collapse, in addition to their rotation, which could influence their mass loss and explosion phenomenology. We find that (i) as in previous studies, larger mass gain by merger favors the production of blue supergiants (BSGs) over red supergiants, and (ii) merger products that end as BSGs at core collap…

Gas in Globular Clusters I: Gas Retention and Its Possible Consequences
Alexey Bobrick, Melvyn B. Davies, Hagai B. Perets
https://arxiv.org/abs/2509.02677 https://

Gas in Globular Clusters I: Gas Retention and Its Possible Consequences
Globular clusters (GCs) host complex stellar populations whose chemical signatures imply early retention and reprocessing of stellar ejecta, yet direct evidence for intracluster gas is lacking. Here we present a unified theoretical framework for the accumulation, fate, and eventual removal of gas released by evolved stars in young GCs, and their implications for the production of multiple stellar populations. Using MIST stellar evolution tracks, we show that low-velocity (< 20 km/s) AGB winds, …

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- What determines the brightness of magnetically open solar corona?: Insights from three-dimensiona...
Haruhisa Iijima

Probing Heavy Dark Matter in Red Giants
Sougata Ganguly, Minxi He, Chang Sub Shin, Oscar Straniero, Seokhoon Yun
https://arxiv.org/abs/2509.03388 https://a…

Probing Heavy Dark Matter in Red Giants
Red giants (RGs) provide a promising astrophysical environment for capturing dark matter (DM) via elastic scattering with stellar nuclei. Captured DM particles migrate toward the helium-rich core and accumulate into a compact configuration. As the DM population grows, it can become self-gravitating and undergo gravitational collapse, leading to adiabatic contraction through interactions with the ambient medium. The resulting energy release, through elastic scattering and, where relevant, DM ann…

An Open-Access Web Tool for Light Curve Simulation and Analysis of Small Solar System Objects
J. L. Rizos, J. L. Ortiz, P. J. Gutierrez, I. M. Navajas, L. M. Lara
https://arxiv.org/abs/2510.03192

An Open-Access Web Tool for Light Curve Simulation and Analysis of Small Solar System Objects
We present a web-based application designed to simulate rotational light curves of small airless Solar System bodies under user-defined geometrical and physical conditions. The tool integrates both physical and empirical photometric models and enables users to input custom shape models, surface properties, and viewing geometries. A dedicated module also computes projected silhouettes at the epoch of stellar occultations, allowing direct comparison with observed chords. The application, develope…

NFL QB rankings, Week 1: Josh Allen 3rd to start 2025 season; Who's No. 1? https://www.nfl.com/news/nfl-qb-rankings-index-week-1-2025-nfl-season

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- SN 2019hnl: A Type IIP Supernova with a Partially Stripped, Low Mass Progenitor
Aidan Martas, et al.

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- An excess of luminous white dwarfs in the peculiar Galactic globular cluster NGC 2808
Laksh Gupta, Samyaday Choudhury, Annalisa Calamida, Christian I. Johnson, Domenico Nardiello

Hierarchical assembly impedes the inference of stellar mass growth histories for individual galaxies
R. K. Cochrane
https://arxiv.org/abs/2509.02700 https://

Hierarchical assembly impedes the inference of stellar mass growth histories for individual galaxies
Some massive, quiescent galaxies at z>3 appear to contain considerable numbers of old stars (forming at z>7). Works inferring the star formation histories of at least one such galaxy observed with JWST have suggested that the assembly of so much stellar mass so early may challenge the well-established Cold Dark Matter (CDM) cosmological framework, or else indicate extraordinarily high past star formation efficiencies. However, these studies implicitly assume that all the stars in place at the e…

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- DIPSY: A new Disc Instability Population SYnthesis, I. Modeling, evolution of individual systems,...
O. Schib, C. Mordasini, A. Emsenhuber, R. Helled

Stellar flare detection in XMM-Newton with gradient boosted trees
Mario Pasquato, Martino Marelli, Andrea De Luca, Ruben Salvaterra, Gaia Carenini, Andrea Belfiore, Andrea Tiengo, Paolo Esposito
https://arxiv.org/abs/2509.24954

Stellar flare detection in XMM-Newton with gradient boosted trees
The EXTraS project, based on data collected with the XMM-Newton observatory, provided us with a vast amount of light curves for X-ray sources. For each light curve, EXTraS also provided us with a set of features (https://extras.inaf.it). We extract from the EXTraS database a tabular dataset of 31,832 variable sources by 108 features. Of these, 13,851 sources were manually labeled as stellar flares or non-flares based on direct visual inspection. We employ a supervised learning approach to produ…

Revisiting the Atmosphere of HD 149026b: The Role of Stellar Abundances and Choice of Opacities in Exoplanet Atmosphere Modeling
Priyanka Baghel, Jayesh Goyal, Gaurav Shukla
https://arxiv.org/abs/2509.25785

Revisiting the Atmosphere of HD 149026b: The Role of Stellar Abundances and Choice of Opacities in Exoplanet Atmosphere Modeling
Planet formation occurs within the same molecular cloud as the host star, suggesting a link between the elemental abundances of star and the planet. Exoplanet atmosphere studies often assume solar abundances for host stars, however, specific host star abundances might lead to more accurate constraints. In this work, we perform sensitivity studies for a metal rich stellar host HD 149026 and its exoplanet HD 149026b, to understand the effect of solar versus stellar abundance choice on the $P$-$T$…

Analytic #Interferometry of Rotating Stellar Surfaces: https://arxiv.org/abs/2509.25433 -> thread https://bsky.app/profile/astroshashank.bsky.social/post/3m24k34dpj22n

Photometric stellar masses for galaxies in DESI Legacy Imaging Surveys
Ivana Ebrov\'a, Michal B\'ilek, Ji\v{r}\'i Eli\'a\v{s}ek
https://arxiv.org/abs/2510.02257 …

Photometric stellar masses for galaxies in DESI Legacy Imaging Surveys
In many areas of extragalactic astrophysics, we need to convert the luminosity of a galaxy into its stellar mass. In this work, we aim to find a simple and effective formula to estimate the stellar mass from the images of galaxies delivered by the currently popular DESI Legacy Imaging Surveys. This survey provides an unsurpassed combination of a deep imaging with an extensive sky coverage in up to four photometric bands. We calibrated the sought formula against a sample of local galaxies observ…

Supermassive black hole growth from stellar binary encounters
Aubrey Jones, Benjamin C. Bromley
https://arxiv.org/abs/2509.02316 https://arxiv.org/pdf/2509…

Supermassive black hole growth from stellar binary encounters
The growth of supermassive black holes (SMBHs) remains a central problem in astrophysics, with current observations providing only limited constraints on the underlying mechanisms. One possible growth channel is stellar accretion via the Hill's mechanism, wherein a SMBH tidally breaks up a passing binary star, capturing and eventually accreting a member of the binary. We adopt a model to predict capture rates from parameters that include the central number density of stars, the stellar velocity…

[2025-09-05 Fri (UTC), 8 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

Amplified capture rate of dark matter in compact binaries and constraints on bosonic dark matter from GW170817
J\'anos Tak\'atsy, Lorenz Zwick, David O'Neill, Johan Samsing
https://arxiv.org/abs/2509.03272

Amplified capture rate of dark matter in compact binaries and constraints on bosonic dark matter from GW170817
The accretion of dark matter (DM) onto compact objects and the potential gravitational collapse of neutron stars due to this accretion has become a promising indirect probe of DM properties, complementing terrestrial experiments. We show that the accretion flux of DM on stellar objects is amplified in binary systems due to the complex gravitational interaction of said particles with the binary. We perform few-body Monte Carlo simulations to show that this amplification factor is $\sim4-5$ for c…

Chronology of our Galaxy from Gaia colour-magnitude diagram fitting (ChronoGal): IV. On the inner Milky Way stellar age distribution
Tom\'as Ruiz-Lara, David Mirabal, Carme Gallart, Robert Grand, Francesca Fragkoudi, Isabel P\'erez, Santi Cassisi, Emma Fern\'andez-Alvar, Anna B. Queiroz, Guillem Aznar-Menargues, Yllari K. Gonz\'alez-Koda, Alicia Rivero, Francisco Surot, Guillaume F. Thomas, Rebekka Bieri, Facundo A. Gomez, R\"udiger Pakmor, Freeke van de Voort

Chronology of our Galaxy from Gaia colour-magnitude diagram fitting (ChronoGal): IV. On the inner Milky Way stellar age distribution
The Milky Way's inner region is dominated by a stellar bar and a boxy-peanut shaped bulge. However, which stellar populations inhabit the inner Galaxy or how star formation proceeded there is still unknown. The difficulty in studying these stars stems from their location in dense regions that are strongly impacted by extinction and crowding effects. In this work, we use star formation histories computed in the solar neighbourhood using Gaia Colour-Magnitude Diagram fitting to shed light onto th…

[2025-10-06 Mon (UTC), 12 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

How stellar mass and disc size shape the formation and migration of super-Earths
Jesper Nielsen, Anders Johansen
https://arxiv.org/abs/2508.21627 https://a…

How stellar mass and disc size shape the formation and migration of super-Earths
The occurrence rate of close-in super-Earths is higher around M-dwarfs compared to stars of higher masses. In this work we aim to understand how the super-Earth population is affected by both the stellar mass, the size of the protoplanetary disc, and viscous heating. We utilise a standard protoplanetary disc model with both irradiated and viscous heating together with a pebble accretion model to simulate the formation and migration of planets. We find that if the disc is heated purely through s…

Lithium Abundances of Main-Sequence Stars in the Old Open Cluster NGC 188: Probes of Stellar Evolution Beyond the Solar Age
Qinghui Sun, Constantine P. Deliyannis, Bruce A. Twarog, Barbara J. Anthony-Twarog
https://arxiv.org/abs/2509.02931

Lithium Abundances of Main-Sequence Stars in the Old Open Cluster NGC 188: Probes of Stellar Evolution Beyond the Solar Age
We present lithium abundances for 119 main-sequence stars in the 6.3 Gyr open cluster NGC 188, using high-resolution, high signal-to-noise ratio spectra from WIYN/Hydra. We observe the stars over multiple nights and measure radial velocities for each night, which we combine with Gaia proper motions to identify multiplicity and cluster membership. We identify 95 single members, 14 binary members, 9 members with uncertain multiplicity, and 1 single likely member. We determine effective temperatur…

An Analysis of the Radius Gap in a Sample of Kepler, K2 and TESS exoplanets orbiting M Dwarf Stars
F\'abio Wanderley, Katia Cunha, Verne V. Smith, Diogo Souto, Ilaria Pascucci, Aida Behmard, Carlos Allende Prieto, Rachael L. Beaton, Dmitry Bizyaev, Simone Daflon, Sten Hasselquist, Steve Howell, Steven R. Majewski, Marc Pinsonneault
https://

An Analysis of the Radius Gap in a Sample of Kepler, K2 and TESS exoplanets orbiting M Dwarf Stars
Planetary radii are derived for 218 exoplanets orbiting 161 M dwarf stars. Stellar radii are based on an analysis of APOGEE high-resolution near-IR spectra for a subsample of the M-dwarfs; these results are used to define a stellar radius-M$_{\rm K_{\rm s}}$ calibration that is applied to the sample of M-dwarf planet hosts. The planetary radius distribution displays a gap over R$_{\rm p}$$\sim$1.6-2.0 R$_{\oplus}$, bordered by two peaks at R$_{\rm p}$$\sim$1.2-1.6 R$_{\oplus}$ (super-Earths) an…

The Role of Asteroseismology in Understanding Mass Loss in Red Giants
Sibel \"Ortel, Mutlu Y{\i}ld{\i}z
https://arxiv.org/abs/2510.02931 https://arxiv…

The Role of Asteroseismology in Understanding Mass Loss in Red Giants
Red giant stars play a key role in advancing our understanding of stellar mass loss. However, its initial mass and the amount of mass lost during this phase remain uncertain. In this study, we investigate the asteroseismic signatures of mass loss and the parameters that influence it. We examine six stars identified as red giant branch (RGB) stars in the APOKASC-2 catalog. Assuming these stars are on their first ascent of the RGB, we construct interior models. The resulting model ages are signif…

Photometric Analysis of 30 Contact Binaries in M31
Xiang Gao, Kai Li, Li-Heng Wang, Hai-bo Yuan, Hong-rui Gu, Ya-Ni Guo
https://arxiv.org/abs/2510.02993 https://

Photometric Analysis of 30 Contact Binaries in M31
M31, as the largest galaxy in the Local Group, is of significant importance for the study of stellar formation and evolution. Based on the data of 5,859 targets observed in M31 by Gu et al (\citeyear{2024ApJS..273....9G}), we selected 30 contact binaries by visual inspection for further study. Using the PHOEBE software and employing Bayesian optimization and Markov Chain Monte Carlo sampling, we determined the physical parameters of these 30 systems. The results show that 10 systems exhibit the…

Measurement of Dark Matter Substructure from the Kinematics of the GD-1 Stellar Stream
Jacob Nibauer, Ana Bonaca, Adrian M. Price-Whelan, David N. Spergel, Jenny E. Greene
https://arxiv.org/abs/2510.02247

Measurement of Dark Matter Substructure from the Kinematics of the GD-1 Stellar Stream
Stellar streams are sensitive tracers of low-mass dark matter subhalos and provide a means to test the Cold Dark Matter (CDM) paradigm on small scales. In this work, we connect the intrinsic velocity dispersion of the GD-1 stream to the number density and internal structure of dark matter subhalos in the mass range $10^5$-$10^9\ M_\odot$. We measure the radial velocity dispersion of GD-1 based on 160 identified member stars across four different spectroscopic catalogs. We use repeat observation…

J-VAR: Analysis of RR Lyrae light curves in seven optical bands
Sayali Kulkarni, H\'ector V\'azquez Rami\'o, Carlos L\'opez-SanJuan, Alessandro Ederoclite, Stylianos Pyrzas
https://arxiv.org/abs/2509.03120

J-VAR: Analysis of RR Lyrae light curves in seven optical bands
Context. RR Lyrae stars are key distance indicators and tracers of old stellar populations in the Milky Way and its satellites. Accurate period and amplitude measurements are essential for constraining stellar evolution and mapping Galactic structure. The Javalambre VARiability (J-VAR) survey provides valuable time-series data across seven optical bands, including gri and four medium and narrow bands. Aims. Our goal is to construct and analyze light curves for RR Lyrae stars identified in the f…

FEAST: JWST/NIRCam view of the Resolved Stellar Populations of the Interacting Dwarf Galaxies NGC~4485/NGC~4490
Giacomo Bortolini, Matteo Correnti, Angela Adamo, Michele Cignoni, Elena Sacchi, Monica Tosi, G\"oran \"Ostlin, Anastasios Kapodistrias, Arjan Bik, Daniela Calzetti, Ana Duarte-Cabral, Flavia Dell'Agli, John S. Gallagher, Benjamin Gregg, Kathryn Grasha, Thomas S. -Y. Lai, Drew Lapeer, Sean T. Linden, Matteo Messa, Alex Pedrini, Elena Sabbi, Linda J. Smith, Helen…

FEAST: JWST/NIRCam view of the Resolved Stellar Populations of the Interacting Dwarf Galaxies NGC~4485/NGC~4490
We present new JWST/NIRCam observations of the interacting dwarf galaxy system NGC 4485/NGC 4490 (a.k.a. Arp 269), obtained as part of the Cycle 1 Feedback in Emerging extrAgalactic Star clusTers (FEAST) program. NGC 4485 and NGC 4490 form the closest known pair of interacting late-type dwarf galaxies (at $\sim 7.4$ Mpc), excluding the Magellanic Clouds. Near-infrared color-magnitude diagrams (CMDs) reveal a wide range of stellar populations in both galaxies, including young ($\lesssim 200$ Myr…

COLIBRE: calibrating subgrid feedback in cosmological simulations that include a cold gas phase
Evgenii Chaikin, Joop Schaye, Matthieu Schaller, Sylvia Ploeckinger, Yannick M. Bah\'e, Alejandro Ben\'itez-Llambay, Camila Correa, Victor J. Forouhar Moreno, Carlos S. Frenk, Filip Hu\v{s}ko, Roi Kugel, Robert McGibbon, Alexander J. Richings, James W. Trayford, Josh Borrow, Robert A. Crain, John C. Helly, Cedric G. Lacey, Aaron Ludlow, Folkert S. J. Nobels

COLIBRE: calibrating subgrid feedback in cosmological simulations that include a cold gas phase
We present the calibration of stellar and active galactic nucleus (AGN) feedback in the subgrid model for the new COLIBRE hydrodynamical simulations of galaxy formation. COLIBRE directly simulates the multi-phase interstellar medium and the evolution of dust grains, which is coupled to the chemistry. COLIBRE is calibrated at three resolutions: particle masses of $m_{\rm gas} \approx m_{\rm dm} \sim 10^7$ (m7), $10^6$ (m6), and $10^5~\mathrm{M_\odot}$ (m5). To calibrate the COLIBRE feedback at m…

Is there a unique asteroseismic interior model for the solar-like oscillating KIC 7747078?
Sibel \"Ortel, Mutlu Y{\i}ld{\i}z, Z. \c{C}elik
https://arxiv.org/abs/2510.02925 …

Is there a unique asteroseismic interior model for the solar-like oscillating KIC 7747078?
Asteroseismology provides a direct observational window into the structure and evolution of stars. While spectroscopic and photometric methods only provide information about the surface properties of stars, asteroseismology, through the analysis of oscillation frequencies, offers comprehensive information about the deep stellar interior as well as the surface. The scattering of effective temperature (Teff) determined from the spectrum and degeneracy in the Hertzsprung Russell diagram poses chal…

Geometry of the Milky Way's dark matter from dynamical models of the tilted stellar halo
Adam M. Dillamore, Jason L. Sanders
https://arxiv.org/abs/2510.00095 https://…

Geometry of the Milky Way's dark matter from dynamical models of the tilted stellar halo
The shape and orientation of the Milky Way's dark matter halo remain poorly constrained. Observations of the accreted stellar halo show that it is triaxial and tilted with respect to the disc. If this configuration is long-lived, it can be used to place constraints on the shape and orientation of the dark matter halo that can support it close to steady state. We fit equilibrium orbit-superposition (Schwarzschild) models to the stellar halo in a realistic Milky Way potential with a tilted dark m…

Far beyond the Sun: III. The magnetic cycle of $\boldsymbol\iota$ Horologii
Juli\'an D. Alvarado-G\'omez (Leibniz Institute for Astrophysics Potsdam, Germany), Gaitee A. J. Hussain (European Space Agency, The Netherlands), Eliana M. Amazo-G\'omez (Leibniz Institute for Astrophysics Potsdam, Germany), Yu Xu (Leibniz Institute for Astrophysics Potsdam, Germany, Peking University, China), Katja Poppenh\"ager (Leibniz Institute for Astrophysics Potsdam, Germany, Potsdam Un…

Far beyond the Sun: III. The magnetic cycle of $\boldsymbolι$ Horologii
We present a comprehensive investigation of the magnetic cycle of the young, active solar analogue $ι$ Horologii ($ι$ Hor) based on intensive spectropolarimetric monitoring using HARPSpol. Over a nearly three-year campaign, the technique of Zeeman-Doppler Imaging (ZDI) was used to reconstruct 18 maps of the large-scale surface magnetic field of the star. These maps trace the evolution of the magnetic field morphology over approximately 139 stellar rotations. Our analysis uncovers pronounced t…

Optimising reference library selection for reference-star differential imaging of discs with SPHERE/IRDIS
S. Stasevic, J. Milli, J. Mazoyer, A. -M. Lagrange, S. Bergeon
https://arxiv.org/abs/2509.03325

Optimising reference library selection for reference-star differential imaging of discs with SPHERE/IRDIS
The direct detection of circumstellar discs through high-contrast imaging provides key insights into the history and dynamics of planetary systems. Pole-on discs, especially faint debris discs, are difficult to detect and require careful consideration during post-processing to remove stellar residuals from the data while preserving the disc signal. Reference-star differential imaging (RDI) serves as one of the primary post-processing methods for disc observations. We aim to develop a method of …

SIGNALS of Giant HII Regions: A Spatially Resolved Analysis of NGC 604
Ray Garner III, Robert C. Kennicutt Jr, Laurent Drissen, Carmelle Robert, Laurie Rousseau-Nepton, Christophe Morisset, Philippe Amram, R. Pierre Martin, Emma Jarvis
https://arxiv.org/abs/2510.03144

SIGNALS of Giant HII Regions: A Spatially Resolved Analysis of NGC 604
Observing giant HII regions at fine spatial scales uncovers detailed structures and reveals variations in ionization, abundance, and dynamical properties of ionized gas and the effect of stellar feedback. Using emission line data of M33 observed with SITELLE as part of the Star-formation, Ionized Gas, and Nebular Abundances Legacy Survey (SIGNALS), we present maps of the principal optical emission line ratios for NGC 604, the most luminous HII region in M33. The excitation maps align well with …

Little Red Dots Are Nurseries of Massive Black Holes
Fabio Pacucci, Lars Hernquist, Michiko Fujii
https://arxiv.org/abs/2509.02664 https://arxiv.org/pdf/25…

Little Red Dots Are Nurseries of Massive Black Holes
The James Webb Space Telescope (JWST) has revealed a previously unknown population of compact, red galaxies at $z \sim 5$, known as "Little Red Dots" (LRDs). With effective radii of $\sim 100$ pc and stellar masses of $10^9-10^{11} \, \rm M_\odot$, a purely stellar interpretation implies extreme central densities, $ρ_\star\sim10^4-10^5 \, \rm M_\odot \, pc^{-3}$ and in some cases up to $\sim 10^9 \, \rm M_\odot \, pc^{-3}$, far exceeding those of globular clusters. At such densities, the dynam…

Carbon and nitrogen as indicators of stellar evolution and age. A homogeneous sample of 44 open clusters from the Gaia-ESO Survey
G. Tautvai\v{s}ien\.e, A. Drazdauskas, \v{S}. Mikolaitis, R. Minkevi\v{c}i\=ut\.e, E. Stonkut\.e, S. Randich, A. Bragaglia, L. Magrini, R. Smiljanic, M. Ambrosch, V. Bagdonas, G. Casali, Y. Chorniy, C. Viscasillas V\'azquez
https…

Carbon and nitrogen as indicators of stellar evolution and age. A homogeneous sample of 44 open clusters from the Gaia-ESO Survey
Context. Low- and intermediate-mass giants undergo a complex chemical evolution that has yet to be observationally probed. The influence of core helium flash on the chemical composition of stellar atmospheres has been an open question since its theoretical prediction 60 years ago. Aims. Based on high-resolution spectral observations of 44 open star clusters in the Gaia-ESO survey, our aim is to perform the first large-scale homogeneous investigation into the carbon and nitrogen photospheric con…

Self-lensing binaries in globular clusters - predictions for ELT
Grzegorz Wiktorowicz, Matthew Middleton, Mirek Giersz, Adam Ingram, Adam McMaster, Abbas Askar, Lucas Hellstr\"om
https://arxiv.org/abs/2510.02751

Self-lensing binaries in globular clusters - predictions for ELT
Self-lensing (SL) represents a powerful technique for detecting compact objects in binary systems through gravitational microlensing effects, when a compact companion transits in front of its luminous partner. We present the first comprehensive study of SL probability within globular cluster (GC) environments, utilizing synthetic stellar populations from MOCCA simulations to predict detection rates for the Extremely Large Telescope (ELT). Our analysis incorporates finite-size lens effects for w…

Crosslisted article(s) found for astro-ph.GA. https://arxiv.org/list/astro-ph.GA/new
[1/1]:
- Axion lines from nuclear de-excitations in galactic stellar populations
Orion Ning, Anupam Ray, Benjamin R. Safdi

M3DIS - A grid of 3D radiation-hydrodynamics stellar atmosphere models for stellar surveys. II. Carbon-enhanced metal-poor stars
Philipp Eitner, Maria Bergemann, Richard Hoppe, Nicholas Storm, Veronika Lipatova, Simon C. O. Glover, Ralf S. Klessen, {\AA}ke Nordlund, Andrius Popovas
https://arxiv.org/abs/2509.24555

M3DIS - A grid of 3D radiation-hydrodynamics stellar atmosphere models for stellar surveys. II. Carbon-enhanced metal-poor stars
Understanding the origin and evolution of carbon-enhanced metal-poor (CEMP) stars is key to tracing the Galaxy's early chemical enrichment. We investigate how realistic 3D radiation-hydrodynamics (RHD) model atmospheres affect carbon abundances in CEMP stars and implications for their classification and Galactic chemical evolution (GCE). We focus on biases from traditional 1D hydrostatic models. We use the M3DIS code to compute 3D RHD model atmospheres for main-sequence and sub-giant stars over…

Rediscovering the Milky Way with an orbit superposition approach and APOGEE data V. The disc growth and history of star formation
Bridget Ratcliffe, Sergey Khoperskov, Nathan Lee, Ivan Minchev, Paola Di Matteo, Glenn van de Ven, Misha Haywood, L\'ea Marques, John Paul Bernaldez, Davor Krajnovi\'c, Matthias Steinmetz
https://arxiv.o…

Rediscovering the Milky Way with an orbit superposition approach and APOGEE data V. The disc growth and history of star formation
The Milky Way's (MW's) star formation history (SFH) offers insight into the chronology of its assembly and the mechanisms driving its structural development. In this study, we present an inference and analysis of the spatially resolved SFH and the MW disc growth. Our approach leverages both stellar birth radii estimates and the complete reconstruction of the MW stellar disc using a novel orbit superposition method from APOGEE data, allowing us to trace the orbit-mass weighted SFH based on forma…

The Stellar Content of NGC~3603 Revisited: Is the IMF Top Heavy?
Philip Massey, Nidia I. Morrell, Kathryn F. Neugent, Monica Herzog, Maria R. Drout, Caitlin O'Brien
https://arxiv.org/abs/2509.25099

The Stellar Content of NGC~3603 Revisited: Is the IMF Top Heavy?
Studies of the resolved stellar populations of young massive clusters have shown that the slope of the initial mass function appears to be the same everywhere, with no dependence on stellar density or metallicity. At the same time, studies of integrated properties of galaxies usually conclude that the IMF does vary, and must be top-heavy in starburst regions. In order to investigate this, we have carried out a long-term project to characterize the massive star content of NGC 3603, the nearest g…

New Interpretation for the Orientation of the LMC's Gaseous Arms B and E using ULLYSES
April Horton, Suraj Poudel, Kathleen A. Barger, Scott Lucchini, David L. Nidever, Erica Chwalik, Frances H. Cashman, Andrew J. Fox, Nicolas Lehner, Dhanesh Krishnarao, Naomi McClure-Griffiths, Elena D'Onghia, Jason Tumlinson, Jo Vazquez, Lauren Sdun, Stone Gebhart, Katherine Anthony, Bryce Cole, Jacco Th. van Loon, John M. Dickey, Callum Lynn, Hiep Nguyen, Min-Young Lee

New Interpretation for the Orientation of the LMC's Gaseous Arms B and E using ULLYSES
The Large Magellanic Cloud (LMC) experiences disruption from tidal and ram-pressure forces as it travels through the halo of the Milky Way. In this project, we combine radio emission-line observations from the GASS and GASKAP surveys with UV absorption-line observations from the HST Ultraviolet Legacy Library of Young Stars as Essential Standards (ULLYSES) program to trace the material in front of the LMC. Along our 8 stellar sightlines near 30 Doradus, we observe gaseous structures likely asso…

Fueling, Evolution, and Diversity of AGN in Dwarf Galaxies: Insights from Star Formation and Black Hole Scaling Relations
G. Mountrichas, M. Siudek, F. J. Carrera
https://arxiv.org/abs/2509.03590

Fueling, Evolution, and Diversity of AGN in Dwarf Galaxies: Insights from Star Formation and Black Hole Scaling Relations
We investigate the star formation activity and black hole scaling relations in a sample of 1451 AGN hosted by dwarf galaxies at redshift 0.5 to 0.9, drawn from the VIPERS survey. The sample comprises Seyferts and LINERs identified through emission-line diagnostics, as well as IR-selected AGN based on WISE colors. Using the parameter SFRnorm, defined as the ratio of the SFR of a galaxy hosting an AGN to the median SFR of star-forming galaxies of similar stellar mass and redshift, we compare AGN …

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Parallel Collisionless Shocks in strongly Magnetized Electron-Ion Plasma. I. Temperature anisotro...
Mohamad Shalaby, Antoine Bret, Federico Fraschetti

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Gas in Globular Clusters I: Gas Retention and Its Possible Consequences
Alexey Bobrick, Melvyn B. Davies, Hagai B. Perets

The incidence of magnetism in blue and yellow straggler stars
S. Hubrig, S. P. J\"arvinen, I. Ilyin, M. Sch\"oller
https://arxiv.org/abs/2509.02304 https://

The incidence of magnetism in blue and yellow straggler stars
Our understanding of the generation of magnetic fields in intermediate-mass and massive OBA stars remains limited. Some theories have proposed that their magnetic fields could be a result of strong binary interactions, including stellar mergers. Blue stragglers, which lie well beyond the main sequence turn-off point on the colour-magnitude diagram of stellar clusters, are widely theorised to be merger products or interacting binaries and therefore can be considered excellent test targets to get…

SNELLS-HD I: a first look at the stellar properties of the massive strong-lens galaxy SNL-1 with 50 pc resolution
Adriano Poci, Russell J. Smith
https://arxiv.org/abs/2509.01732

SNELLS-HD I: a first look at the stellar properties of the massive strong-lens galaxy SNL-1 with 50 pc resolution
We present a dynamical and chemical study of the centre of a massive early-type strong-lens galaxy ESO286-G022 (SNL-1). Analysing new data obtained through the adaptive-optics-assisted Narrow-Field Mode of VLT/MUSE, we aim to measure the mass distribution and internal properties of SNL-1 at $\sim 50\ {\rm pc}$ resolution. In particular, we aim to address the tension in the reported IMF measurements of SNL-1 between strong-lens/dynamical and spectral-fitting techniques. We fit a triaxial orbital…

MESA Isochrones and Stellar Tracks (MIST) III. The White Dwarf Cooling Sequence
Evan B. Bauer, Aaron Dotter, Charlie Conroy, Tim Cunningham, Minjung Park, Pier-Emmanuel Tremblay
https://arxiv.org/abs/2509.21717

MESA Isochrones and Stellar Tracks (MIST) III. The White Dwarf Cooling Sequence
We present a substantial update to the MESA Isochrones and Stellar Tracks (MIST) library, extending the MIST model grids and isochrones down the white dwarf (WD) cooling sequence with realistic physics for WD cooling timescales. This work provides a large grid of MESA models for carbon-oxygen core WDs with hydrogen atmospheres (spectral type DA/DC), descended from full prior stellar evolution calculations. The model tracks, isochrones, and WD cooling timescale contours are available on the MIST…

Multiple star-forming episodes of intermediate-redshift galaxies
C. Mu\~noz L\'opez, Davor Krajnovi\'c, B. Epinat, T. Urrutia, I. Pessa, T. Contini, T. Nanayakkara, J. Pharo, T. S. Gon\c{c}alves, Tran Thi Thai, N. F. Bouch\'e
https://arxiv.org/abs/2509.01710

Multiple star-forming episodes of intermediate-redshift galaxies
We derive and analyse the star formation histories of 393 intermediate-redshift (0.1 $\leq$ z $\leq$ 0.9) galaxies with stellar masses between $\sim$10$^{8}$ - 10$^{12}$ M$_{\odot}$. We probe a cosmic time of approximately 6 Gyr and a range of environments, from field (low-density systems) to rich groups (high-density systems). We find that the galaxies' stellar mean ages, metallicities, and star formation rates (SFRs) follow similar trends to galaxies as those characterising the nearby Univers…

[2025-09-04 Thu (UTC), 17 new articles found for astro-ph.SR Solar and Stellar Astrophysics]
toXiv_bot_toot

The Stellar Mass and Age Distributions of Star-Forming Clumps at $0.5 < z < 5$ in JWST CANUCS: Implications for Clump Formation and Destruction
Visal Sok, Adam Muzzin, Vivian Yun Yan Tan, Yoshihisa Asada, Maru\v{s}a Brada\v{c}, Nicholas S. Martis, Ga\"el Noirot, Ghassan T. E. Sarrouh, Marcin Sawicki, Chris J. Willott, Sunna Withers, Samantha C. Berek, Katherine Myers

The Stellar Mass and Age Distributions of Star-Forming Clumps at $0.5 < z < 5$ in JWST CANUCS: Implications for Clump Formation and Destruction
We investigate the resolved properties of star-forming clumps and their host galaxies at $0.5

Chemodynamics of Bo\"otesI with $S^{5}$: Revised Velocity Gradient, Dark Matter Density, and Galactic Chemical Evolution Constraints
Nathan R. Sandford, Ting S. Li, Sergey E. Koposov, Kohei Hayashi, Andrew B. Pace, Denis Erkal, Jo Bovy, Gary S. Da Costa, Lara R. Cullinane, Alexander P. Ji, Kyler Kuehn, Daniel B. Zucker, Guilherme Limberg, Gustavo E. Medina, Joshua D. Simon, Yong Yang, S5 Collaboration

Chemodynamics of BoötesI with $S^{5}$: Revised Velocity Gradient, Dark Matter Density, and Galactic Chemical Evolution Constraints
We combine new spectroscopic observations of the ultra faint dwarf galaxy (UFD) Boötes I (Boo I) from the Southern Stellar Stream Spectroscopic Survey ($S^{5}$) with $\sim$15 years of archival spectroscopic data to create the largest sample of stellar kinematics and metallicities to date in any Milky Way UFD. Our combined sample includes 148 members extending out to $\sim$7 half-light radii ($r_h$), including 24 newly confirmed members, 18 binary candidates, 15 RR Lyrae stars, and 92 [Fe/H] me…

The spatially-resolved effect of mergers on the stellar mass assembly of MaNGA galaxies
Eirini Angeloudi, Marc Huertas-Company, Jes\'us Falc\'on-Barroso, Laurence Perreault-Levasseur, Alexandre Adam, Alina Boecker
https://arxiv.org/abs/2509.25340

The spatially-resolved effect of mergers on the stellar mass assembly of MaNGA galaxies
Understanding the origin of stars within a galaxy - whether formed in-situ or accreted from other galaxies (ex-situ) - is key to constraining its evolution. Spatially resolving these components provides crucial insights into a galaxy's mass assembly history. We aim to predict the spatial distribution of ex-situ stellar mass fraction in MaNGA galaxies, and to identify distinct assembly histories based on the radial gradients of these predictions in the central regions. We employ a diffusion mode…

The Diversity and Evolution of Dust Attenuation Curves from Redshift z ~ 1 to 9
Irene Shivaei, Rohan P. Naidu, Francisco Rodr\'iguez Montero, Kosei Matsumoto, Joel Leja, Jorryt Matthee, Benjamin D. Johnson, Pascal A. Oesch, Jacopo Chevallard, Angela Adamo, Sarah Bodansky, Andrew J. Bunker, Alba Covelo Paz, Claudia Di Cesare, Eiichi Egami, Lukas J. Furtak, Kasper E. Heintz, Ivan Kramarenko, Romain A. Meyer, Naveen A. Reddy, Pierluigi Rinaldi, Sandro Tacchella, Alberto Torralba, Jori…

The Diversity and Evolution of Dust Attenuation Curves from Redshift z ~ 1 to 9
The UV-optical dust attenuation curve is key to interpreting the intrinsic properties of galaxies and provides insights into the nature of dust grains and their geometry relative to stars. In this work, we constrain the UV-optical slope of the stellar attenuation curve using a spectroscopic-redshift sample of ~3300 galaxies at z~1-9, to characterize the diversity and redshift evolution of stellar attenuation curves and to gain insight into dust production and evolution at high redshifts. The sa…

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Fates of Rotating Supergiants from Stellar Mergers and the Landscape of Transients upon Core-coll...
Daichi Tsuna (Caltech), Jim Fuller (Caltech), Wenbin Lu (UC Berkeley)

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Energetic Ion Composition as a Means of Investigating the Physical Origins of Alpha Particle Heav...
Emily McDougall, Bala Poduval

What do we mean by stellar mass? The impact of the pre-main sequence on the mass to light ratio of young and intermediate age stellar populations
Elizabeth R. Stanway (University of Warwick, UK), Conor M. Byrne (University of Warwick, UK), Ankur Upadhyaya (University of Warwick, UK)
https://arxiv.org/abs/2508.16394

What do we mean by stellar mass? The impact of the pre-main sequence on the mass to light ratio of young and intermediate age stellar populations
Stellar population synthesis models are an essential tool with which galaxy physical parameters are extracted from observations. However they are built on assumptions designed for use in the local Universe, and not always appropriate to high redshift galaxies. Here we consider the impact of including the hitherto-neglected stellar pre-main sequence delay timescale on the interpretation of composite stellar populations at ages of <1 Gyr. We find that doing so has an impact on the optical luminos…

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Mapping atmospheric features of the planetary-mass brown dwarf SIMP 0136 with JWST NIRISS
Roman Akhmetshyn, et al.

Measuring the Central Dark Mass in NGC 4258 with JWST/NIRSpec Stellar Kinematics
Dieu D. Nguyen, Hai N. Ngo, Michele Cappellari, Tinh Q. T. Le, Tien H. T. Ho, Tuan N. Le, Elena Gallo, Niranjan Thatte, Fan Zou, Michele Perna, Miguel Pereira-Santaella
https://arxiv.org/abs/2509.20519

Measuring the Central Dark Mass in NGC 4258 with JWST/NIRSpec Stellar Kinematics
We present a new stellar dynamical measurement of the supermassive black hole (SMBH) mass in the nearby spiral galaxy NGC 4258, a critical benchmark for extragalactic mass measurements. We use archival JWST/NIRSpec IFU data (G235H/F170LP grating) to extract high-resolution two-dimensional stellar kinematics from the CO bandhead absorption features within the central $3'' \times 3''$. We extract the stellar kinematics after correcting for instrumental artifacts and separating the stellar light f…

Replaced article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Apsidal motion and proximity effects in the massive binary BD 60 497
Gregor Rauw, Piotr A. Kolaczek-Szymanski, Yael Naze, Lucas Nys

Crosslisted article(s) found for astro-ph.SR. https://arxiv.org/list/astro-ph.SR/new
[1/1]:
- Solar Hegemony: M-Dwarfs Are Unlikely to Host Observers Such as Ourselves
David Kipping

Double-faced white dwarfs and the magnetic inhibition of convection
Sivan Ginzburg
https://arxiv.org/abs/2509.02671 https://arxiv.org/pdf/2509.02671…

Double-faced white dwarfs and the magnetic inhibition of convection
About one in five white dwarfs undergoes spectral evolution from a helium atmosphere to hydrogen and then back to helium. These short-lived hydrogen envelopes - the result of residual hydrogen diffusion - are eventually destroyed by either hydrogen or helium convection. An emerging class of double-faced white dwarfs seems to catch this process in the act, with varying amounts of hydrogen across regions of the stellar surface. Here, we quantitatively test the hypothesis that these inhomogeneitie…

GravSphere2: A higher-order Jeans method for mass-modeling spherical stellar systems
Andr\'es Ba\~nares-Hern\'andez, Justin I. Read, Mariana P. J\'ulio
https://arxiv.org/abs/2509.24103

GravSphere2: A higher-order Jeans method for mass-modeling spherical stellar systems
Mass-modeling methods are used to infer the gravitational field of stellar systems, from globular clusters to giant elliptical galaxies. While many methods exist, most require assumptions about the form of the underlying distribution function or data binning that leads to loss of information. With only line-of-sight (LOS) data, many methods suffer from the well-known mass-anisotropy degeneracy. To overcome these limitations, we develop a new, publicly available mass-modeling method, GravSphere2…

The Corona-Australis star-forming region: New insights on its formation history from detailed stellar and disk analysis
Elisabetta Rigliaco, Raffaele Gratton, Valerio Nascimbeni
https://arxiv.org/abs/2508.19757

The Corona-Australis star-forming region: New insights on its formation history from detailed stellar and disk analysis
The star-forming complex of Corona Australis (CrA) is one of the closest and most isolated molecular clouds. It belongs to a chain of clusters that show age gradients with distance from the galactic plane. We aim to provide suggestions regarding its formation history by examining the stellar and disk populations, stellar multiplicity, and interstellar absorption. We made a census of stars and disks using Gaia DR3 and infrared data. Interstellar absorption in the direction of each star was deriv…

SAGAbg III: Environmental Stellar Mass Functions, Self-Quenching, and the Stellar-to-Halo Mass Relation in the Dwarf Galaxy Regime
Erin Kado-Fong, Yao-Yuan Mao, Yasmeen Asali, Marla Geha, Risa H. Wechsler, Mithi A. C. de los Reyes, Yunchong Wang, Ethan O. Nadler, Nitya Kallivayalil, Erik J. Tollerud, Benjamin Weiner
https://arxiv.org/abs/2…

SAGAbg III: Environmental Stellar Mass Functions, Self-Quenching, and the Stellar-to-Halo Mass Relation in the Dwarf Galaxy Regime
Recent efforts have extended our view of the number and properties of satellite galaxies beyond the Local Group firmly down to $\rm M_\star\sim 10^6 M_\odot$. A similarly complete view of the field dwarf population has lagged behind. Using the background galaxies sample from the Satellites Around Galactic Analogs (SAGA) Survey at $z<0.05$, we take inventory of the dwarf population down to $\rm M_\star \sim 5\times10^6 M_\odot$ using three metrics: the stellar mass function (SMF) as function of …

A Comparison of Full Spectral Fitting Codes for Measuring the Stellar Initial Mass Function and Other Stellar Population Properties in Elliptical Galaxies
Ilaria Lonoce, Anja Feldmeier-Krause, Alexandra Masegian, Wendy L. Freedman
https://arxiv.org/abs/2508.16525

A Comparison of Full Spectral Fitting Codes for Measuring the Stellar Initial Mass Function and Other Stellar Population Properties in Elliptical Galaxies
We present a comparative test of four widely used full spectral fitting codes, with the aim of answering the question: how robust is the retrieval of the stellar initial mass function (IMF) and other stellar properties of galaxies? We used ALF, PyStaff, Starlight, and pPXF to fit a set of optical+near-infrared spectroscopic data from the Magellan telescope of the two brightest galaxies in the Fornax cluster, NGC1399 and NGC1404. By fitting the same data set with the same models, we can compare …

Dynamical Masses for 23 Pre-Main Sequence Stars in Upper Scorpius: A Critical Test of Stellar Evolutionary Models
A. P. M. Towner, J. A. Eisner, P. D. Sheehan, L. A. Hillenbrand, Y. -L. Wu
https://arxiv.org/abs/2509.23001

Dynamical Masses for 23 Pre-Main Sequence Stars in Upper Scorpius: A Critical Test of Stellar Evolutionary Models
We present dynamical masses for 23 pre-main sequence K- and M-type stars in the Upper Scorpius star-forming region. These masses were derived from the Keplerian rotation of CO disk gas using the MCMC radiative-transfer package pdspy and a flared-disk model with 15 free parameters. We compare our dynamical masses to those derived from five pre-main sequence evolutionary models, and find that most models consistently underestimate stellar mass by $\gtrsim$25%. Models with updated treatment of ste…